Transitional computer user interface for a display screen



FIG. 1 is a front view of a transitional computer user interface for a display screen showing our new design; and,

FIG. 2 is a front view of a second image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-2. The process or period in which an image transitions to another forms no part of the claimed design.

The broken line showing of the display screen, text, images and lines form no part of the claimed design. 

The ornamental design for a transitional computer user interface for a display screen, as shown and described. 